<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>具有响应式特性的嵌入内容</title>
    <link href="bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <div class="container">
        <div class="embed-responsive embed-responsive-16by9">
            <iframe src="10.mp4" class="embed-responsive-item"></iframe>
        </div>
    </div>
</body>
</html>